maybe, there is a powdered developer solution that requires only a few chemicals
so you don't have to cross your fingers and hope. d23 ( for example ) is for film
and is only 2 chemicals, it is low contrast and might work for paper negatives

Distilled Water (125 degrees F) . . . . . . . 750 ml
Metol . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5 g
Sodium Sulfite (Anhydrous) . . . . . . . . . . 100 g
Cold Water to make . . . . . . . . . . . . . . . . . . 1 ltr


before you go, maybe you can do a test to see how it works ..
you can keep the chemicals separate, and only mix as you need it ..
maybe ... you can boost the contrast for your final prints by adding
a little more metol ? or bring a 3 chemical ... Hydroquinone
and make something that suits your needs more ...

me? i'd probably use plain old instant coffee and sodium carbonate ..
cheap and easy ... BUT it is slow working so it might take an extra minute or 2 to develop your prints.

good luck and have a great time on your trip !
sounds like a lot of fun

john